I would appreciate some help on my new fish ashtray. The design reminds me of a couple of the pieces on Jindrich's site. The bowl part of the ashtray itself is made to appear opalino using swirls of blue and white glass. It looks like the bases of some of the lampwork figurines from Zelezny Brod Sklo. The colors selected for the fish also remind me of ZBS. The inside of the ashtray feels textured. The piece is 5" tall to the tip of the tail. Could my ashtray be Czech? I would love to hear it is ZBS.